Since chrome wheels often give problems, I bought polished aluminum instead, Fikse 5S style, from Lingenfelter: they fit C5 and C6s. Get them with full polish and they gleam just like chrome but the "shiny part" will never flake off and you take no chances on weakened wheels from aftermarket chroming ovens.

I've got chrome 18' CCW's and they're sweet as hell but they do show some wear...they came on the car when I got it so I dont know how old they are but definitely not old enough to be having little bubbles start to surface...polished aluminum will give you problems if you dont detail them enough too though. they'll start to "pit".